General Science-38

1. A certain amount of cold air will weigh heavier than the same amount of dry air because of the:

A. greater number of molecules at low temperature
B. lesser number of molecules at high temperature
C. greater energy of molecules at high temperature
D. lesser energy of molecules at high temperature

2. A free-floating astronaut ‘A’ pushes another free-floating astronaut ‘B’ in space. The mass of ‘A’ is greater than that of ‘B’. The force exerted by astronaut ‘A’ on astronaut ‘B’ will be:
A. equal to zero
B. equal to the force exerted by ‘B’ on ‘A’
C. greater than the force exerted by ‘B’ on ‘A’
D. less than the force exerted by ‘B’ on ‘A’

3. On the lunar surface:

A. weight remains same but mass varies
B. mass remains same but weight varies
C. both of them vary
D. None of the above is true

4. The effect of circular movements on a person in a satellite around the earth is that:

A. his mass becomes nil while the weight remains the same
B. his mass remains constant while weight becomes zero
C. his mass goes up while the weight remains unchanged
D. None of the above

5. A wooden block is floating in water. If 4/5 of its volume is immersed in water and volume of the water displaced is 800ml, the volume of the block is:
A. 1140 ml
B. 200 ml
C. 800 ml
D. 100 ml

6. A balloon filled with air is weighted (W) so that it just floats in water. When it is further pushed a short distance in water it will:
A. sink to the bottom
B. stay at the depth where it stands submerged
C. not come back to its original position
D. sink down a little further but will not reach the bottom

7. Oil, water and gas can be present in a well in the ascending order of:

A. water, oil, gas
B. gas, water, oil
C. water, gas, oil
D. oil, water, gas

8. Mercury is preferred to water in barometer because:

A. mercury is good conductor of heat
B. mercury is bright and hence its level can be easily read
C. mercury is available in pure form
D. mercury has high density and low surface tension


9. An airplane rises up:

A. on account of upward thrust of air
B. as the air over the airplane is denser than that under the plane
C. as the pressure over its wings is more than the pressure under them
D. as its nose is pointed upwards

0. A boat filed with some stones is floating in water. If the stones are dropped into the water, the level of the water will:

A. rise
B. decrease
C. remain the same
D. insufficient data to predict

11. When a ship enters sea from a river, its level:

A. remains same
B. rises
C. may or may not change
D. decreases

12. There is a hole in the boat through which water is seeping into the boat. Just before the boat capsizes :

A. water level in the boat will increase
B. water level will decrease
C. water level will remain constant
D. None of these

13. An ice cube is floating in a glass of water. How will the water level be affected when the ice cube melts?

A. The level of water will go up
B. The level of water will go down
C. The level of water will remain unchanged
D. In the beginning the level will go up but later on the level will go down

14. Fathom is the unit of:

A. sound
B. depth
C. distance
D. frequency

15. Ordinary clocks lose time during summer. It is so because the length of their pendulum:

A. increases and so does the length of time
B. increases and therefore its duration of time decreases
C. decreases and therefore the length of time increases
D. decreases and therefore the length of time decreases

16. A body is attached to a spring balance suspended from a stand. The reading on the balance is 0.5 kg. The two together are detached from the stand and allowed to fall through a height. While falling the reading in the balance will be:

A. zero
B. less than 0.5kg but not zero
C. more than 0.5 kg depending on the height
D. 0.5 kg


17. Two bars of gold and silver are weighed by spring balance and read 200 gms each. These bars are then suspended in a liquid and weighed by using the same balance. What could be derived?
A. Gold will weigh more than silver
B. Silver will weigh more than gold
C. Both the bars will be equal in weight
D. Nothing can be said, unless the density of the liquid is known

18. Which one of the following will take place when a watch based on oscillating spring is taken to a deep mine?
A. It will become slow
B. It will become fast
C. It will indicate the same time as on earth
D. It will stop working

19. Very small-time intervals are accurately measured by the:

A. pulsars
B. while dwarfs
C. atomic clocks
D. quartz clocks

20. Match the following:
List I                                         List II
a. Cusec                                   1. Pressure
b. Byte                                      2. Intensity of Earthquake
c. Ricter                                    3. Rate of Flow
d. Bar                                       4. Computer Memory

A. a4, b1, c2, d3
B. a2, b4, c3, d1
C. a3, b4, c2, d1
D. a3, b2, c1, d4